Calculus Examples

$y = \frac{2}{5 x^{4}}$

Step 1

Since $\frac{2}{5}$ is constant with respect to $x$ , the derivative of $\frac{2}{5 x^{4}}$ with respect to $x$ is $\frac{2}{5} \frac{d}{d x} [\frac{1}{x^{4}}]$ .

$\frac{2}{5} \frac{d}{d x} [\frac{1}{x^{4}}]$

Step 2

Apply basic rules of exponents.

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Step 2.1

Rewrite $\frac{1}{x^{4}}$ as ${(x^{4})}^{- 1}$ .

$\frac{2}{5} \frac{d}{d x} [{(x^{4})}^{- 1}]$

Step 2.2

Multiply the exponents in ${(x^{4})}^{- 1}$ .

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Step 2.2.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{2}{5} \frac{d}{d x} [x^{4 \cdot - 1}]$

Step 2.2.2

Multiply $4$ by $- 1$ .

$\frac{2}{5} \frac{d}{d x} [x^{- 4}]$

Step 3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = - 4$ .

$\frac{2}{5} (- 4 x^{- 5})$

Step 4

Combine fractions.

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Step 4.1

Combine $- 4$ and $\frac{2}{5}$ .

$\frac{- 4 \cdot 2}{5} x^{- 5}$

Step 4.2

Multiply $- 4$ by $2$ .

$\frac{- 8}{5} x^{- 5}$

Step 4.3

Combine $\frac{- 8}{5}$ and $x^{- 5}$ .

$\frac{- 8 x^{- 5}}{5}$

Step 4.4

Simplify the expression.

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Step 4.4.1

Move $x^{- 5}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{- 8}{5 x^{5}}$

Step 4.4.2

Move the negative in front of the fraction.

$- \frac{8}{5 x^{5}}$